Bay, red bay most often, is the second most common color on a finnhorse after chestnut, about 4% of the population (Source). The amount of bay horses has grown in the last few years due to a few good studs who happen to be bay. For years it was easy to guess a horses sire by its colour, since Hovi-Ari was a very popular stud of his time. His son Humeeti is the only known homozygous bay finnhorse, always producing a bay foal. Nowadays there are few more, for example R-stud Vihi-Totti seems to have already had an impact.